What are the main factors affecting the electret treatment effect of meltblown nonwoven fabrics

Charging conditions: charging time, charging distance, charging voltage The charging voltage has a greater influence on the filtration efficiency of polypropylene meltblown nonwoven materials. The higher the charging voltage, the stronger the intensity of the electric field formed, and the higher and more stable surface potential of the PP fiber; but the excessively high voltage will cause the material to be broken down, and the surface electrostatic charge will decrease instead. According to available information, with the increase of the charging voltage, the filtration efficiency of 20g/m² meltblown nonwoven fabric has increased from 26.5% before electret treatment to 79.5% after treatment, and the filtration efficiency of 40g/m² meltblown nonwoven fabric From 51.8% before electret treatment to 95.62% after treatment. Thickness: The greater the thickness, the more potential traps formed on the surface and inside of the fiber, which will capture more charge electret materials: Electret materials are composed of dielectric materials that can store charges for a long time, and other auxiliary materials. Manufactured by a special process. It can assist in increasing the density and depth of the charges generated in the charge trapping electret treatment of the meltblown nonwovens, so as to improve the comprehensive filtration efficiency and thermal attenuation resistance of the meltblown nonwovens. It is worth noting that the air permeability of polypropylene meltblown nonwovens is affected by the material pore size and porosity. The electret treatment does not affect the three-dimensional structure of the nonwovens. Therefore, the electret treatment does not affect the air permeability. Sex.